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- W2418941160 abstract "The polarized Fourier transform infrared (FTIR) spectroscopy is used to study the surface-capped Fe2O3 nanoparticles and nanoparticle arrays. The independent manometer-sized Fe2O3 crystals show typical confined phonon mode in relation to the, alpha -Fe2O3 phase. For the aggregates on different substrates the FTIR showed different behavior as compared with the isolated dispersions in KBr pellets, on the surface of Si wafer with those close-packed on the surface of KBr pellets and on the surface of Si wafers. The vibration mode variations in these spectra are discussed in terms of the enhancement of multipolar interactions, vibrational anisotropy and long-range electron-phonon interactions, as well as magnetic coupling. Clear longitudinal optic phonon (LO) and transverse optic phonon (TO) splitting in the spectra of aggregate on the surface of. KBr pellets indicating a long-range order array is observed. Magnetic coupling as an additional term of multipolar coupling enhancement may play an important role in the nanocrystal ordering. The observed contributions from ordered coupling are in contrast to a model by Gerardy and Ausloos, in which the Frohlich modes are dominant for isotropic nanoparticle aggregation, because Fe2O3 crystal has anisotropic structure due to the magnetic couplings. However, their model applies for our particle aggregates upon exposure to air for a few days and for samples with large size distribution, in which the temporal dipolar interaction is dominant. This spectral variation indicates a transformation from ordered magnetic arrays to a Frohlich (charge-fluctuation)-like aggregates." @default.
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- W2418941160 date "2001-01-01" @default.
- W2418941160 modified "2023-09-26" @default.
- W2418941160 title "Infrared vibration studies of nanometer-sized Fe2O3 arrays" @default.
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